1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ 30 */ 31 32 /*- 33 * Copyright (c) 1982, 1986, 1988, 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 61 */ 62 63 #include <sys/cdefs.h> 64 __FBSDID("$FreeBSD$"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipsec.h" 69 #include "opt_sctp.h" 70 #include "opt_route.h" 71 72 #include <sys/param.h> 73 #include <sys/kernel.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/errno.h> 77 #include <sys/priv.h> 78 #include <sys/proc.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/syslog.h> 83 #include <sys/ucred.h> 84 85 #include <net/if.h> 86 #include <net/netisr.h> 87 #include <net/route.h> 88 #include <net/pfil.h> 89 #include <net/vnet.h> 90 91 #include <netinet/in.h> 92 #include <netinet/in_var.h> 93 #include <netinet6/in6_var.h> 94 #include <netinet/ip6.h> 95 #include <netinet/icmp6.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet/in_pcb.h> 98 #include <netinet/tcp_var.h> 99 #include <netinet6/nd6.h> 100 101 #ifdef IPSEC 102 #include <netipsec/ipsec.h> 103 #include <netipsec/ipsec6.h> 104 #include <netipsec/key.h> 105 #include <netinet6/ip6_ipsec.h> 106 #endif /* IPSEC */ 107 #ifdef SCTP 108 #include <netinet/sctp.h> 109 #include <netinet/sctp_crc32.h> 110 #endif 111 112 #include <netinet6/ip6protosw.h> 113 #include <netinet6/scope6_var.h> 114 115 #ifdef FLOWTABLE 116 #include <net/flowtable.h> 117 #endif 118 119 extern int in6_mcast_loop; 120 121 struct ip6_exthdrs { 122 struct mbuf *ip6e_ip6; 123 struct mbuf *ip6e_hbh; 124 struct mbuf *ip6e_dest1; 125 struct mbuf *ip6e_rthdr; 126 struct mbuf *ip6e_dest2; 127 }; 128 129 static int ip6_pcbopt __P((int, u_char *, int, struct ip6_pktopts **, 130 struct ucred *, int)); 131 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 132 struct socket *, struct sockopt *)); 133 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 134 static int ip6_setpktopt __P((int, u_char *, int, struct ip6_pktopts *, 135 struct ucred *, int, int, int)); 136 137 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 138 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 139 struct ip6_frag **)); 140 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 141 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 142 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 143 struct ifnet *, struct in6_addr *, u_long *, int *)); 144 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 145 146 147 /* 148 * Make an extension header from option data. hp is the source, and 149 * mp is the destination. 150 */ 151 #define MAKE_EXTHDR(hp, mp) \ 152 do { \ 153 if (hp) { \ 154 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 155 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 156 ((eh)->ip6e_len + 1) << 3); \ 157 if (error) \ 158 goto freehdrs; \ 159 } \ 160 } while (/*CONSTCOND*/ 0) 161 162 /* 163 * Form a chain of extension headers. 164 * m is the extension header mbuf 165 * mp is the previous mbuf in the chain 166 * p is the next header 167 * i is the type of option. 168 */ 169 #define MAKE_CHAIN(m, mp, p, i)\ 170 do {\ 171 if (m) {\ 172 if (!hdrsplit) \ 173 panic("assumption failed: hdr not split"); \ 174 *mtod((m), u_char *) = *(p);\ 175 *(p) = (i);\ 176 p = mtod((m), u_char *);\ 177 (m)->m_next = (mp)->m_next;\ 178 (mp)->m_next = (m);\ 179 (mp) = (m);\ 180 }\ 181 } while (/*CONSTCOND*/ 0) 182 183 /* 184 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 185 * header (with pri, len, nxt, hlim, src, dst). 186 * This function may modify ver and hlim only. 187 * The mbuf chain containing the packet will be freed. 188 * The mbuf opt, if present, will not be freed. 189 * 190 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 191 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 192 * which is rt_rmx.rmx_mtu. 193 * 194 * ifpp - XXX: just for statistics 195 */ 196 int 197 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 198 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 199 struct ifnet **ifpp, struct inpcb *inp) 200 { 201 struct ip6_hdr *ip6, *mhip6; 202 struct ifnet *ifp, *origifp; 203 struct mbuf *m = m0; 204 struct mbuf *mprev = NULL; 205 int hlen, tlen, len, off; 206 struct route_in6 ip6route; 207 struct rtentry *rt = NULL; 208 struct sockaddr_in6 *dst, src_sa, dst_sa; 209 struct in6_addr odst; 210 int error = 0; 211 struct in6_ifaddr *ia = NULL; 212 u_long mtu; 213 int alwaysfrag, dontfrag; 214 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 215 struct ip6_exthdrs exthdrs; 216 struct in6_addr finaldst, src0, dst0; 217 u_int32_t zone; 218 struct route_in6 *ro_pmtu = NULL; 219 int flevalid = 0; 220 int hdrsplit = 0; 221 int needipsec = 0; 222 #ifdef SCTP 223 int sw_csum; 224 #endif 225 #ifdef IPSEC 226 struct ipsec_output_state state; 227 struct ip6_rthdr *rh = NULL; 228 int needipsectun = 0; 229 int segleft_org = 0; 230 struct secpolicy *sp = NULL; 231 #endif /* IPSEC */ 232 233 ip6 = mtod(m, struct ip6_hdr *); 234 if (ip6 == NULL) { 235 printf ("ip6 is NULL"); 236 goto bad; 237 } 238 239 finaldst = ip6->ip6_dst; 240 bzero(&exthdrs, sizeof(exthdrs)); 241 if (opt) { 242 /* Hop-by-Hop options header */ 243 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 244 /* Destination options header(1st part) */ 245 if (opt->ip6po_rthdr) { 246 /* 247 * Destination options header(1st part) 248 * This only makes sense with a routing header. 249 * See Section 9.2 of RFC 3542. 250 * Disabling this part just for MIP6 convenience is 251 * a bad idea. We need to think carefully about a 252 * way to make the advanced API coexist with MIP6 253 * options, which might automatically be inserted in 254 * the kernel. 255 */ 256 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 257 } 258 /* Routing header */ 259 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 260 /* Destination options header(2nd part) */ 261 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 262 } 263 264 /* 265 * IPSec checking which handles several cases. 266 * FAST IPSEC: We re-injected the packet. 267 */ 268 #ifdef IPSEC 269 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp, &sp)) 270 { 271 case 1: /* Bad packet */ 272 goto freehdrs; 273 case -1: /* Do IPSec */ 274 needipsec = 1; 275 case 0: /* No IPSec */ 276 default: 277 break; 278 } 279 #endif /* IPSEC */ 280 281 /* 282 * Calculate the total length of the extension header chain. 283 * Keep the length of the unfragmentable part for fragmentation. 284 */ 285 optlen = 0; 286 if (exthdrs.ip6e_hbh) 287 optlen += exthdrs.ip6e_hbh->m_len; 288 if (exthdrs.ip6e_dest1) 289 optlen += exthdrs.ip6e_dest1->m_len; 290 if (exthdrs.ip6e_rthdr) 291 optlen += exthdrs.ip6e_rthdr->m_len; 292 unfragpartlen = optlen + sizeof(struct ip6_hdr); 293 294 /* NOTE: we don't add AH/ESP length here. do that later. */ 295 if (exthdrs.ip6e_dest2) 296 optlen += exthdrs.ip6e_dest2->m_len; 297 298 /* 299 * If we need IPsec, or there is at least one extension header, 300 * separate IP6 header from the payload. 301 */ 302 if ((needipsec || optlen) && !hdrsplit) { 303 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 304 m = NULL; 305 goto freehdrs; 306 } 307 m = exthdrs.ip6e_ip6; 308 hdrsplit++; 309 } 310 311 /* adjust pointer */ 312 ip6 = mtod(m, struct ip6_hdr *); 313 314 /* adjust mbuf packet header length */ 315 m->m_pkthdr.len += optlen; 316 plen = m->m_pkthdr.len - sizeof(*ip6); 317 318 /* If this is a jumbo payload, insert a jumbo payload option. */ 319 if (plen > IPV6_MAXPACKET) { 320 if (!hdrsplit) { 321 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 322 m = NULL; 323 goto freehdrs; 324 } 325 m = exthdrs.ip6e_ip6; 326 hdrsplit++; 327 } 328 /* adjust pointer */ 329 ip6 = mtod(m, struct ip6_hdr *); 330 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 331 goto freehdrs; 332 ip6->ip6_plen = 0; 333 } else 334 ip6->ip6_plen = htons(plen); 335 336 /* 337 * Concatenate headers and fill in next header fields. 338 * Here we have, on "m" 339 * IPv6 payload 340 * and we insert headers accordingly. Finally, we should be getting: 341 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 342 * 343 * during the header composing process, "m" points to IPv6 header. 344 * "mprev" points to an extension header prior to esp. 345 */ 346 u_char *nexthdrp = &ip6->ip6_nxt; 347 mprev = m; 348 349 /* 350 * we treat dest2 specially. this makes IPsec processing 351 * much easier. the goal here is to make mprev point the 352 * mbuf prior to dest2. 353 * 354 * result: IPv6 dest2 payload 355 * m and mprev will point to IPv6 header. 356 */ 357 if (exthdrs.ip6e_dest2) { 358 if (!hdrsplit) 359 panic("assumption failed: hdr not split"); 360 exthdrs.ip6e_dest2->m_next = m->m_next; 361 m->m_next = exthdrs.ip6e_dest2; 362 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 363 ip6->ip6_nxt = IPPROTO_DSTOPTS; 364 } 365 366 /* 367 * result: IPv6 hbh dest1 rthdr dest2 payload 368 * m will point to IPv6 header. mprev will point to the 369 * extension header prior to dest2 (rthdr in the above case). 370 */ 371 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 372 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 373 IPPROTO_DSTOPTS); 374 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 375 IPPROTO_ROUTING); 376 377 #ifdef IPSEC 378 if (!needipsec) 379 goto skip_ipsec2; 380 381 /* 382 * pointers after IPsec headers are not valid any more. 383 * other pointers need a great care too. 384 * (IPsec routines should not mangle mbufs prior to AH/ESP) 385 */ 386 exthdrs.ip6e_dest2 = NULL; 387 388 if (exthdrs.ip6e_rthdr) { 389 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 390 segleft_org = rh->ip6r_segleft; 391 rh->ip6r_segleft = 0; 392 } 393 394 bzero(&state, sizeof(state)); 395 state.m = m; 396 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 397 &needipsectun); 398 m = state.m; 399 if (error == EJUSTRETURN) { 400 /* 401 * We had a SP with a level of 'use' and no SA. We 402 * will just continue to process the packet without 403 * IPsec processing. 404 */ 405 ; 406 } else if (error) { 407 /* mbuf is already reclaimed in ipsec6_output_trans. */ 408 m = NULL; 409 switch (error) { 410 case EHOSTUNREACH: 411 case ENETUNREACH: 412 case EMSGSIZE: 413 case ENOBUFS: 414 case ENOMEM: 415 break; 416 default: 417 printf("[%s:%d] (ipsec): error code %d\n", 418 __func__, __LINE__, error); 419 /* FALLTHROUGH */ 420 case ENOENT: 421 /* don't show these error codes to the user */ 422 error = 0; 423 break; 424 } 425 goto bad; 426 } else if (!needipsectun) { 427 /* 428 * In the FAST IPSec case we have already 429 * re-injected the packet and it has been freed 430 * by the ipsec_done() function. So, just clean 431 * up after ourselves. 432 */ 433 m = NULL; 434 goto done; 435 } 436 if (exthdrs.ip6e_rthdr) { 437 /* ah6_output doesn't modify mbuf chain */ 438 rh->ip6r_segleft = segleft_org; 439 } 440 skip_ipsec2:; 441 #endif /* IPSEC */ 442 443 /* 444 * If there is a routing header, discard the packet. 445 */ 446 if (exthdrs.ip6e_rthdr) { 447 error = EINVAL; 448 goto bad; 449 } 450 451 /* Source address validation */ 452 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 453 (flags & IPV6_UNSPECSRC) == 0) { 454 error = EOPNOTSUPP; 455 V_ip6stat.ip6s_badscope++; 456 goto bad; 457 } 458 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 459 error = EOPNOTSUPP; 460 V_ip6stat.ip6s_badscope++; 461 goto bad; 462 } 463 464 V_ip6stat.ip6s_localout++; 465 466 /* 467 * Route packet. 468 */ 469 if (ro == 0) { 470 ro = &ip6route; 471 bzero((caddr_t)ro, sizeof(*ro)); 472 } 473 ro_pmtu = ro; 474 if (opt && opt->ip6po_rthdr) 475 ro = &opt->ip6po_route; 476 dst = (struct sockaddr_in6 *)&ro->ro_dst; 477 #ifdef FLOWTABLE 478 if (ro == &ip6route) { 479 struct flentry *fle; 480 481 /* 482 * The flow table returns route entries valid for up to 30 483 * seconds; we rely on the remainder of ip_output() taking no 484 * longer than that long for the stability of ro_rt. The 485 * flow ID assignment must have happened before this point. 486 */ 487 if ((fle = flowtable_lookup_mbuf(V_ip6_ft, m, AF_INET6)) != NULL) { 488 flow_to_route_in6(fle, ro); 489 if (ro->ro_rt != NULL && ro->ro_lle != NULL) 490 flevalid = 1; 491 } 492 } 493 #endif 494 again: 495 /* 496 * if specified, try to fill in the traffic class field. 497 * do not override if a non-zero value is already set. 498 * we check the diffserv field and the ecn field separately. 499 */ 500 if (opt && opt->ip6po_tclass >= 0) { 501 int mask = 0; 502 503 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 504 mask |= 0xfc; 505 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 506 mask |= 0x03; 507 if (mask != 0) 508 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 509 } 510 511 /* fill in or override the hop limit field, if necessary. */ 512 if (opt && opt->ip6po_hlim != -1) 513 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 514 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 515 if (im6o != NULL) 516 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 517 else 518 ip6->ip6_hlim = V_ip6_defmcasthlim; 519 } 520 521 #ifdef IPSEC 522 /* 523 * We may re-inject packets into the stack here. 524 */ 525 if (needipsec && needipsectun) { 526 struct ipsec_output_state state; 527 528 /* 529 * All the extension headers will become inaccessible 530 * (since they can be encrypted). 531 * Don't panic, we need no more updates to extension headers 532 * on inner IPv6 packet (since they are now encapsulated). 533 * 534 * IPv6 [ESP|AH] IPv6 [extension headers] payload 535 */ 536 bzero(&exthdrs, sizeof(exthdrs)); 537 exthdrs.ip6e_ip6 = m; 538 539 bzero(&state, sizeof(state)); 540 state.m = m; 541 state.ro = (struct route *)ro; 542 state.dst = (struct sockaddr *)dst; 543 544 error = ipsec6_output_tunnel(&state, sp, flags); 545 546 m = state.m; 547 ro = (struct route_in6 *)state.ro; 548 dst = (struct sockaddr_in6 *)state.dst; 549 if (error == EJUSTRETURN) { 550 /* 551 * We had a SP with a level of 'use' and no SA. We 552 * will just continue to process the packet without 553 * IPsec processing. 554 */ 555 ; 556 } else if (error) { 557 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 558 m0 = m = NULL; 559 m = NULL; 560 switch (error) { 561 case EHOSTUNREACH: 562 case ENETUNREACH: 563 case EMSGSIZE: 564 case ENOBUFS: 565 case ENOMEM: 566 break; 567 default: 568 printf("[%s:%d] (ipsec): error code %d\n", 569 __func__, __LINE__, error); 570 /* FALLTHROUGH */ 571 case ENOENT: 572 /* don't show these error codes to the user */ 573 error = 0; 574 break; 575 } 576 goto bad; 577 } else { 578 /* 579 * In the FAST IPSec case we have already 580 * re-injected the packet and it has been freed 581 * by the ipsec_done() function. So, just clean 582 * up after ourselves. 583 */ 584 m = NULL; 585 goto done; 586 } 587 588 exthdrs.ip6e_ip6 = m; 589 } 590 #endif /* IPSEC */ 591 592 /* adjust pointer */ 593 ip6 = mtod(m, struct ip6_hdr *); 594 595 bzero(&dst_sa, sizeof(dst_sa)); 596 dst_sa.sin6_family = AF_INET6; 597 dst_sa.sin6_len = sizeof(dst_sa); 598 dst_sa.sin6_addr = ip6->ip6_dst; 599 if (flevalid) { 600 rt = ro->ro_rt; 601 ifp = ro->ro_rt->rt_ifp; 602 } else if ((error = in6_selectroute(&dst_sa, opt, im6o, ro, 603 &ifp, &rt)) != 0) { 604 switch (error) { 605 case EHOSTUNREACH: 606 V_ip6stat.ip6s_noroute++; 607 break; 608 case EADDRNOTAVAIL: 609 default: 610 break; /* XXX statistics? */ 611 } 612 if (ifp != NULL) 613 in6_ifstat_inc(ifp, ifs6_out_discard); 614 goto bad; 615 } 616 if (rt == NULL) { 617 /* 618 * If in6_selectroute() does not return a route entry, 619 * dst may not have been updated. 620 */ 621 *dst = dst_sa; /* XXX */ 622 } 623 624 /* 625 * then rt (for unicast) and ifp must be non-NULL valid values. 626 */ 627 if ((flags & IPV6_FORWARDING) == 0) { 628 /* XXX: the FORWARDING flag can be set for mrouting. */ 629 in6_ifstat_inc(ifp, ifs6_out_request); 630 } 631 if (rt != NULL) { 632 ia = (struct in6_ifaddr *)(rt->rt_ifa); 633 rt->rt_use++; 634 } 635 636 637 /* 638 * The outgoing interface must be in the zone of source and 639 * destination addresses. 640 */ 641 origifp = ifp; 642 643 src0 = ip6->ip6_src; 644 if (in6_setscope(&src0, origifp, &zone)) 645 goto badscope; 646 bzero(&src_sa, sizeof(src_sa)); 647 src_sa.sin6_family = AF_INET6; 648 src_sa.sin6_len = sizeof(src_sa); 649 src_sa.sin6_addr = ip6->ip6_src; 650 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 651 goto badscope; 652 653 dst0 = ip6->ip6_dst; 654 if (in6_setscope(&dst0, origifp, &zone)) 655 goto badscope; 656 /* re-initialize to be sure */ 657 bzero(&dst_sa, sizeof(dst_sa)); 658 dst_sa.sin6_family = AF_INET6; 659 dst_sa.sin6_len = sizeof(dst_sa); 660 dst_sa.sin6_addr = ip6->ip6_dst; 661 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) { 662 goto badscope; 663 } 664 665 /* We should use ia_ifp to support the case of 666 * sending packets to an address of our own. 667 */ 668 if (ia != NULL && ia->ia_ifp) 669 ifp = ia->ia_ifp; 670 671 /* scope check is done. */ 672 goto routefound; 673 674 badscope: 675 V_ip6stat.ip6s_badscope++; 676 in6_ifstat_inc(origifp, ifs6_out_discard); 677 if (error == 0) 678 error = EHOSTUNREACH; /* XXX */ 679 goto bad; 680 681 routefound: 682 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 683 if (opt && opt->ip6po_nextroute.ro_rt) { 684 /* 685 * The nexthop is explicitly specified by the 686 * application. We assume the next hop is an IPv6 687 * address. 688 */ 689 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 690 } 691 else if ((rt->rt_flags & RTF_GATEWAY)) 692 dst = (struct sockaddr_in6 *)rt->rt_gateway; 693 } 694 695 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 696 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 697 } else { 698 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 699 in6_ifstat_inc(ifp, ifs6_out_mcast); 700 /* 701 * Confirm that the outgoing interface supports multicast. 702 */ 703 if (!(ifp->if_flags & IFF_MULTICAST)) { 704 V_ip6stat.ip6s_noroute++; 705 in6_ifstat_inc(ifp, ifs6_out_discard); 706 error = ENETUNREACH; 707 goto bad; 708 } 709 if ((im6o == NULL && in6_mcast_loop) || 710 (im6o && im6o->im6o_multicast_loop)) { 711 /* 712 * Loop back multicast datagram if not expressly 713 * forbidden to do so, even if we have not joined 714 * the address; protocols will filter it later, 715 * thus deferring a hash lookup and lock acquisition 716 * at the expense of an m_copym(). 717 */ 718 ip6_mloopback(ifp, m, dst); 719 } else { 720 /* 721 * If we are acting as a multicast router, perform 722 * multicast forwarding as if the packet had just 723 * arrived on the interface to which we are about 724 * to send. The multicast forwarding function 725 * recursively calls this function, using the 726 * IPV6_FORWARDING flag to prevent infinite recursion. 727 * 728 * Multicasts that are looped back by ip6_mloopback(), 729 * above, will be forwarded by the ip6_input() routine, 730 * if necessary. 731 */ 732 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 733 /* 734 * XXX: ip6_mforward expects that rcvif is NULL 735 * when it is called from the originating path. 736 * However, it is not always the case, since 737 * some versions of MGETHDR() does not 738 * initialize the field. 739 */ 740 m->m_pkthdr.rcvif = NULL; 741 if (ip6_mforward(ip6, ifp, m) != 0) { 742 m_freem(m); 743 goto done; 744 } 745 } 746 } 747 /* 748 * Multicasts with a hoplimit of zero may be looped back, 749 * above, but must not be transmitted on a network. 750 * Also, multicasts addressed to the loopback interface 751 * are not sent -- the above call to ip6_mloopback() will 752 * loop back a copy if this host actually belongs to the 753 * destination group on the loopback interface. 754 */ 755 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 756 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 757 m_freem(m); 758 goto done; 759 } 760 } 761 762 /* 763 * Fill the outgoing inteface to tell the upper layer 764 * to increment per-interface statistics. 765 */ 766 if (ifpp) 767 *ifpp = ifp; 768 769 /* Determine path MTU. */ 770 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 771 &alwaysfrag)) != 0) 772 goto bad; 773 774 /* 775 * The caller of this function may specify to use the minimum MTU 776 * in some cases. 777 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 778 * setting. The logic is a bit complicated; by default, unicast 779 * packets will follow path MTU while multicast packets will be sent at 780 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 781 * including unicast ones will be sent at the minimum MTU. Multicast 782 * packets will always be sent at the minimum MTU unless 783 * IP6PO_MINMTU_DISABLE is explicitly specified. 784 * See RFC 3542 for more details. 785 */ 786 if (mtu > IPV6_MMTU) { 787 if ((flags & IPV6_MINMTU)) 788 mtu = IPV6_MMTU; 789 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 790 mtu = IPV6_MMTU; 791 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 792 (opt == NULL || 793 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 794 mtu = IPV6_MMTU; 795 } 796 } 797 798 /* 799 * clear embedded scope identifiers if necessary. 800 * in6_clearscope will touch the addresses only when necessary. 801 */ 802 in6_clearscope(&ip6->ip6_src); 803 in6_clearscope(&ip6->ip6_dst); 804 805 /* 806 * If the outgoing packet contains a hop-by-hop options header, 807 * it must be examined and processed even by the source node. 808 * (RFC 2460, section 4.) 809 */ 810 if (exthdrs.ip6e_hbh) { 811 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 812 u_int32_t dummy; /* XXX unused */ 813 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 814 815 #ifdef DIAGNOSTIC 816 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 817 panic("ip6e_hbh is not continuous"); 818 #endif 819 /* 820 * XXX: if we have to send an ICMPv6 error to the sender, 821 * we need the M_LOOP flag since icmp6_error() expects 822 * the IPv6 and the hop-by-hop options header are 823 * continuous unless the flag is set. 824 */ 825 m->m_flags |= M_LOOP; 826 m->m_pkthdr.rcvif = ifp; 827 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 828 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 829 &dummy, &plen) < 0) { 830 /* m was already freed at this point */ 831 error = EINVAL;/* better error? */ 832 goto done; 833 } 834 m->m_flags &= ~M_LOOP; /* XXX */ 835 m->m_pkthdr.rcvif = NULL; 836 } 837 838 /* Jump over all PFIL processing if hooks are not active. */ 839 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 840 goto passout; 841 842 odst = ip6->ip6_dst; 843 /* Run through list of hooks for output packets. */ 844 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 845 if (error != 0 || m == NULL) 846 goto done; 847 ip6 = mtod(m, struct ip6_hdr *); 848 849 /* See if destination IP address was changed by packet filter. */ 850 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 851 m->m_flags |= M_SKIP_FIREWALL; 852 /* If destination is now ourself drop to ip6_input(). */ 853 if (in6_localaddr(&ip6->ip6_dst)) { 854 if (m->m_pkthdr.rcvif == NULL) 855 m->m_pkthdr.rcvif = V_loif; 856 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 857 m->m_pkthdr.csum_flags |= 858 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 859 m->m_pkthdr.csum_data = 0xffff; 860 } 861 m->m_pkthdr.csum_flags |= 862 CSUM_IP_CHECKED | CSUM_IP_VALID; 863 #ifdef SCTP 864 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 865 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 866 #endif 867 error = netisr_queue(NETISR_IPV6, m); 868 goto done; 869 } else 870 goto again; /* Redo the routing table lookup. */ 871 } 872 873 /* XXX: IPFIREWALL_FORWARD */ 874 875 passout: 876 /* 877 * Send the packet to the outgoing interface. 878 * If necessary, do IPv6 fragmentation before sending. 879 * 880 * the logic here is rather complex: 881 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 882 * 1-a: send as is if tlen <= path mtu 883 * 1-b: fragment if tlen > path mtu 884 * 885 * 2: if user asks us not to fragment (dontfrag == 1) 886 * 2-a: send as is if tlen <= interface mtu 887 * 2-b: error if tlen > interface mtu 888 * 889 * 3: if we always need to attach fragment header (alwaysfrag == 1) 890 * always fragment 891 * 892 * 4: if dontfrag == 1 && alwaysfrag == 1 893 * error, as we cannot handle this conflicting request 894 */ 895 #ifdef SCTP 896 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist; 897 if (sw_csum & CSUM_SCTP) { 898 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 899 sw_csum &= ~CSUM_SCTP; 900 } 901 #endif 902 tlen = m->m_pkthdr.len; 903 904 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 905 dontfrag = 1; 906 else 907 dontfrag = 0; 908 if (dontfrag && alwaysfrag) { /* case 4 */ 909 /* conflicting request - can't transmit */ 910 error = EMSGSIZE; 911 goto bad; 912 } 913 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 914 /* 915 * Even if the DONTFRAG option is specified, we cannot send the 916 * packet when the data length is larger than the MTU of the 917 * outgoing interface. 918 * Notify the error by sending IPV6_PATHMTU ancillary data as 919 * well as returning an error code (the latter is not described 920 * in the API spec.) 921 */ 922 u_int32_t mtu32; 923 struct ip6ctlparam ip6cp; 924 925 mtu32 = (u_int32_t)mtu; 926 bzero(&ip6cp, sizeof(ip6cp)); 927 ip6cp.ip6c_cmdarg = (void *)&mtu32; 928 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 929 (void *)&ip6cp); 930 931 error = EMSGSIZE; 932 goto bad; 933 } 934 935 /* 936 * transmit packet without fragmentation 937 */ 938 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 939 struct in6_ifaddr *ia6; 940 941 ip6 = mtod(m, struct ip6_hdr *); 942 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 943 if (ia6) { 944 /* Record statistics for this interface address. */ 945 ia6->ia_ifa.if_opackets++; 946 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 947 ifa_free(&ia6->ia_ifa); 948 } 949 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 950 goto done; 951 } 952 953 /* 954 * try to fragment the packet. case 1-b and 3 955 */ 956 if (mtu < IPV6_MMTU) { 957 /* path MTU cannot be less than IPV6_MMTU */ 958 error = EMSGSIZE; 959 in6_ifstat_inc(ifp, ifs6_out_fragfail); 960 goto bad; 961 } else if (ip6->ip6_plen == 0) { 962 /* jumbo payload cannot be fragmented */ 963 error = EMSGSIZE; 964 in6_ifstat_inc(ifp, ifs6_out_fragfail); 965 goto bad; 966 } else { 967 struct mbuf **mnext, *m_frgpart; 968 struct ip6_frag *ip6f; 969 u_int32_t id = htonl(ip6_randomid()); 970 u_char nextproto; 971 972 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 973 974 /* 975 * Too large for the destination or interface; 976 * fragment if possible. 977 * Must be able to put at least 8 bytes per fragment. 978 */ 979 hlen = unfragpartlen; 980 if (mtu > IPV6_MAXPACKET) 981 mtu = IPV6_MAXPACKET; 982 983 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 984 if (len < 8) { 985 error = EMSGSIZE; 986 in6_ifstat_inc(ifp, ifs6_out_fragfail); 987 goto bad; 988 } 989 990 /* 991 * Verify that we have any chance at all of being able to queue 992 * the packet or packet fragments 993 */ 994 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 995 < tlen /* - hlen */)) { 996 error = ENOBUFS; 997 V_ip6stat.ip6s_odropped++; 998 goto bad; 999 } 1000 1001 mnext = &m->m_nextpkt; 1002 1003 /* 1004 * Change the next header field of the last header in the 1005 * unfragmentable part. 1006 */ 1007 if (exthdrs.ip6e_rthdr) { 1008 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1009 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1010 } else if (exthdrs.ip6e_dest1) { 1011 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1012 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1013 } else if (exthdrs.ip6e_hbh) { 1014 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1015 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1016 } else { 1017 nextproto = ip6->ip6_nxt; 1018 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1019 } 1020 1021 /* 1022 * Loop through length of segment after first fragment, 1023 * make new header and copy data of each part and link onto 1024 * chain. 1025 */ 1026 m0 = m; 1027 for (off = hlen; off < tlen; off += len) { 1028 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1029 if (!m) { 1030 error = ENOBUFS; 1031 V_ip6stat.ip6s_odropped++; 1032 goto sendorfree; 1033 } 1034 m->m_pkthdr.rcvif = NULL; 1035 m->m_flags = m0->m_flags & M_COPYFLAGS; 1036 *mnext = m; 1037 mnext = &m->m_nextpkt; 1038 m->m_data += max_linkhdr; 1039 mhip6 = mtod(m, struct ip6_hdr *); 1040 *mhip6 = *ip6; 1041 m->m_len = sizeof(*mhip6); 1042 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1043 if (error) { 1044 V_ip6stat.ip6s_odropped++; 1045 goto sendorfree; 1046 } 1047 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1048 if (off + len >= tlen) 1049 len = tlen - off; 1050 else 1051 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1052 mhip6->ip6_plen = htons((u_short)(len + hlen + 1053 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1054 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1055 error = ENOBUFS; 1056 V_ip6stat.ip6s_odropped++; 1057 goto sendorfree; 1058 } 1059 m_cat(m, m_frgpart); 1060 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1061 m->m_pkthdr.rcvif = NULL; 1062 ip6f->ip6f_reserved = 0; 1063 ip6f->ip6f_ident = id; 1064 ip6f->ip6f_nxt = nextproto; 1065 V_ip6stat.ip6s_ofragments++; 1066 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1067 } 1068 1069 in6_ifstat_inc(ifp, ifs6_out_fragok); 1070 } 1071 1072 /* 1073 * Remove leading garbages. 1074 */ 1075 sendorfree: 1076 m = m0->m_nextpkt; 1077 m0->m_nextpkt = 0; 1078 m_freem(m0); 1079 for (m0 = m; m; m = m0) { 1080 m0 = m->m_nextpkt; 1081 m->m_nextpkt = 0; 1082 if (error == 0) { 1083 /* Record statistics for this interface address. */ 1084 if (ia) { 1085 ia->ia_ifa.if_opackets++; 1086 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1087 } 1088 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1089 } else 1090 m_freem(m); 1091 } 1092 1093 if (error == 0) 1094 V_ip6stat.ip6s_fragmented++; 1095 1096 done: 1097 if (ro == &ip6route && ro->ro_rt && flevalid == 0) { 1098 /* brace necessary for RTFREE */ 1099 RTFREE(ro->ro_rt); 1100 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt && 1101 ((flevalid == 0) || (ro_pmtu != ro))) { 1102 RTFREE(ro_pmtu->ro_rt); 1103 } 1104 #ifdef IPSEC 1105 if (sp != NULL) 1106 KEY_FREESP(&sp); 1107 #endif 1108 1109 return (error); 1110 1111 freehdrs: 1112 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1113 m_freem(exthdrs.ip6e_dest1); 1114 m_freem(exthdrs.ip6e_rthdr); 1115 m_freem(exthdrs.ip6e_dest2); 1116 /* FALLTHROUGH */ 1117 bad: 1118 if (m) 1119 m_freem(m); 1120 goto done; 1121 } 1122 1123 static int 1124 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1125 { 1126 struct mbuf *m; 1127 1128 if (hlen > MCLBYTES) 1129 return (ENOBUFS); /* XXX */ 1130 1131 MGET(m, M_DONTWAIT, MT_DATA); 1132 if (!m) 1133 return (ENOBUFS); 1134 1135 if (hlen > MLEN) { 1136 MCLGET(m, M_DONTWAIT); 1137 if ((m->m_flags & M_EXT) == 0) { 1138 m_free(m); 1139 return (ENOBUFS); 1140 } 1141 } 1142 m->m_len = hlen; 1143 if (hdr) 1144 bcopy(hdr, mtod(m, caddr_t), hlen); 1145 1146 *mp = m; 1147 return (0); 1148 } 1149 1150 /* 1151 * Insert jumbo payload option. 1152 */ 1153 static int 1154 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1155 { 1156 struct mbuf *mopt; 1157 u_char *optbuf; 1158 u_int32_t v; 1159 1160 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1161 1162 /* 1163 * If there is no hop-by-hop options header, allocate new one. 1164 * If there is one but it doesn't have enough space to store the 1165 * jumbo payload option, allocate a cluster to store the whole options. 1166 * Otherwise, use it to store the options. 1167 */ 1168 if (exthdrs->ip6e_hbh == 0) { 1169 MGET(mopt, M_DONTWAIT, MT_DATA); 1170 if (mopt == 0) 1171 return (ENOBUFS); 1172 mopt->m_len = JUMBOOPTLEN; 1173 optbuf = mtod(mopt, u_char *); 1174 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1175 exthdrs->ip6e_hbh = mopt; 1176 } else { 1177 struct ip6_hbh *hbh; 1178 1179 mopt = exthdrs->ip6e_hbh; 1180 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1181 /* 1182 * XXX assumption: 1183 * - exthdrs->ip6e_hbh is not referenced from places 1184 * other than exthdrs. 1185 * - exthdrs->ip6e_hbh is not an mbuf chain. 1186 */ 1187 int oldoptlen = mopt->m_len; 1188 struct mbuf *n; 1189 1190 /* 1191 * XXX: give up if the whole (new) hbh header does 1192 * not fit even in an mbuf cluster. 1193 */ 1194 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1195 return (ENOBUFS); 1196 1197 /* 1198 * As a consequence, we must always prepare a cluster 1199 * at this point. 1200 */ 1201 MGET(n, M_DONTWAIT, MT_DATA); 1202 if (n) { 1203 MCLGET(n, M_DONTWAIT); 1204 if ((n->m_flags & M_EXT) == 0) { 1205 m_freem(n); 1206 n = NULL; 1207 } 1208 } 1209 if (!n) 1210 return (ENOBUFS); 1211 n->m_len = oldoptlen + JUMBOOPTLEN; 1212 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1213 oldoptlen); 1214 optbuf = mtod(n, caddr_t) + oldoptlen; 1215 m_freem(mopt); 1216 mopt = exthdrs->ip6e_hbh = n; 1217 } else { 1218 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1219 mopt->m_len += JUMBOOPTLEN; 1220 } 1221 optbuf[0] = IP6OPT_PADN; 1222 optbuf[1] = 1; 1223 1224 /* 1225 * Adjust the header length according to the pad and 1226 * the jumbo payload option. 1227 */ 1228 hbh = mtod(mopt, struct ip6_hbh *); 1229 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1230 } 1231 1232 /* fill in the option. */ 1233 optbuf[2] = IP6OPT_JUMBO; 1234 optbuf[3] = 4; 1235 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1236 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1237 1238 /* finally, adjust the packet header length */ 1239 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1240 1241 return (0); 1242 #undef JUMBOOPTLEN 1243 } 1244 1245 /* 1246 * Insert fragment header and copy unfragmentable header portions. 1247 */ 1248 static int 1249 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1250 struct ip6_frag **frghdrp) 1251 { 1252 struct mbuf *n, *mlast; 1253 1254 if (hlen > sizeof(struct ip6_hdr)) { 1255 n = m_copym(m0, sizeof(struct ip6_hdr), 1256 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1257 if (n == 0) 1258 return (ENOBUFS); 1259 m->m_next = n; 1260 } else 1261 n = m; 1262 1263 /* Search for the last mbuf of unfragmentable part. */ 1264 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1265 ; 1266 1267 if ((mlast->m_flags & M_EXT) == 0 && 1268 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1269 /* use the trailing space of the last mbuf for the fragment hdr */ 1270 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1271 mlast->m_len); 1272 mlast->m_len += sizeof(struct ip6_frag); 1273 m->m_pkthdr.len += sizeof(struct ip6_frag); 1274 } else { 1275 /* allocate a new mbuf for the fragment header */ 1276 struct mbuf *mfrg; 1277 1278 MGET(mfrg, M_DONTWAIT, MT_DATA); 1279 if (mfrg == 0) 1280 return (ENOBUFS); 1281 mfrg->m_len = sizeof(struct ip6_frag); 1282 *frghdrp = mtod(mfrg, struct ip6_frag *); 1283 mlast->m_next = mfrg; 1284 } 1285 1286 return (0); 1287 } 1288 1289 static int 1290 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1291 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1292 int *alwaysfragp) 1293 { 1294 u_int32_t mtu = 0; 1295 int alwaysfrag = 0; 1296 int error = 0; 1297 1298 if (ro_pmtu != ro) { 1299 /* The first hop and the final destination may differ. */ 1300 struct sockaddr_in6 *sa6_dst = 1301 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1302 if (ro_pmtu->ro_rt && 1303 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1304 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1305 RTFREE(ro_pmtu->ro_rt); 1306 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1307 } 1308 if (ro_pmtu->ro_rt == NULL) { 1309 bzero(sa6_dst, sizeof(*sa6_dst)); 1310 sa6_dst->sin6_family = AF_INET6; 1311 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1312 sa6_dst->sin6_addr = *dst; 1313 1314 rtalloc((struct route *)ro_pmtu); 1315 } 1316 } 1317 if (ro_pmtu->ro_rt) { 1318 u_int32_t ifmtu; 1319 struct in_conninfo inc; 1320 1321 bzero(&inc, sizeof(inc)); 1322 inc.inc_flags |= INC_ISIPV6; 1323 inc.inc6_faddr = *dst; 1324 1325 if (ifp == NULL) 1326 ifp = ro_pmtu->ro_rt->rt_ifp; 1327 ifmtu = IN6_LINKMTU(ifp); 1328 mtu = tcp_hc_getmtu(&inc); 1329 if (mtu) 1330 mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu); 1331 else 1332 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1333 if (mtu == 0) 1334 mtu = ifmtu; 1335 else if (mtu < IPV6_MMTU) { 1336 /* 1337 * RFC2460 section 5, last paragraph: 1338 * if we record ICMPv6 too big message with 1339 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1340 * or smaller, with framgent header attached. 1341 * (fragment header is needed regardless from the 1342 * packet size, for translators to identify packets) 1343 */ 1344 alwaysfrag = 1; 1345 mtu = IPV6_MMTU; 1346 } else if (mtu > ifmtu) { 1347 /* 1348 * The MTU on the route is larger than the MTU on 1349 * the interface! This shouldn't happen, unless the 1350 * MTU of the interface has been changed after the 1351 * interface was brought up. Change the MTU in the 1352 * route to match the interface MTU (as long as the 1353 * field isn't locked). 1354 */ 1355 mtu = ifmtu; 1356 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1357 } 1358 } else if (ifp) { 1359 mtu = IN6_LINKMTU(ifp); 1360 } else 1361 error = EHOSTUNREACH; /* XXX */ 1362 1363 *mtup = mtu; 1364 if (alwaysfragp) 1365 *alwaysfragp = alwaysfrag; 1366 return (error); 1367 } 1368 1369 /* 1370 * IP6 socket option processing. 1371 */ 1372 int 1373 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1374 { 1375 int optdatalen, uproto; 1376 void *optdata; 1377 struct inpcb *in6p = sotoinpcb(so); 1378 int error, optval; 1379 int level, op, optname; 1380 int optlen; 1381 struct thread *td; 1382 1383 level = sopt->sopt_level; 1384 op = sopt->sopt_dir; 1385 optname = sopt->sopt_name; 1386 optlen = sopt->sopt_valsize; 1387 td = sopt->sopt_td; 1388 error = 0; 1389 optval = 0; 1390 uproto = (int)so->so_proto->pr_protocol; 1391 1392 if (level == IPPROTO_IPV6) { 1393 switch (op) { 1394 1395 case SOPT_SET: 1396 switch (optname) { 1397 case IPV6_2292PKTOPTIONS: 1398 #ifdef IPV6_PKTOPTIONS 1399 case IPV6_PKTOPTIONS: 1400 #endif 1401 { 1402 struct mbuf *m; 1403 1404 error = soopt_getm(sopt, &m); /* XXX */ 1405 if (error != 0) 1406 break; 1407 error = soopt_mcopyin(sopt, m); /* XXX */ 1408 if (error != 0) 1409 break; 1410 error = ip6_pcbopts(&in6p->in6p_outputopts, 1411 m, so, sopt); 1412 m_freem(m); /* XXX */ 1413 break; 1414 } 1415 1416 /* 1417 * Use of some Hop-by-Hop options or some 1418 * Destination options, might require special 1419 * privilege. That is, normal applications 1420 * (without special privilege) might be forbidden 1421 * from setting certain options in outgoing packets, 1422 * and might never see certain options in received 1423 * packets. [RFC 2292 Section 6] 1424 * KAME specific note: 1425 * KAME prevents non-privileged users from sending or 1426 * receiving ANY hbh/dst options in order to avoid 1427 * overhead of parsing options in the kernel. 1428 */ 1429 case IPV6_RECVHOPOPTS: 1430 case IPV6_RECVDSTOPTS: 1431 case IPV6_RECVRTHDRDSTOPTS: 1432 if (td != NULL) { 1433 error = priv_check(td, 1434 PRIV_NETINET_SETHDROPTS); 1435 if (error) 1436 break; 1437 } 1438 /* FALLTHROUGH */ 1439 case IPV6_UNICAST_HOPS: 1440 case IPV6_HOPLIMIT: 1441 case IPV6_FAITH: 1442 1443 case IPV6_RECVPKTINFO: 1444 case IPV6_RECVHOPLIMIT: 1445 case IPV6_RECVRTHDR: 1446 case IPV6_RECVPATHMTU: 1447 case IPV6_RECVTCLASS: 1448 case IPV6_V6ONLY: 1449 case IPV6_AUTOFLOWLABEL: 1450 case IPV6_BINDANY: 1451 if (optname == IPV6_BINDANY && td != NULL) { 1452 error = priv_check(td, 1453 PRIV_NETINET_BINDANY); 1454 if (error) 1455 break; 1456 } 1457 1458 if (optlen != sizeof(int)) { 1459 error = EINVAL; 1460 break; 1461 } 1462 error = sooptcopyin(sopt, &optval, 1463 sizeof optval, sizeof optval); 1464 if (error) 1465 break; 1466 switch (optname) { 1467 1468 case IPV6_UNICAST_HOPS: 1469 if (optval < -1 || optval >= 256) 1470 error = EINVAL; 1471 else { 1472 /* -1 = kernel default */ 1473 in6p->in6p_hops = optval; 1474 if ((in6p->inp_vflag & 1475 INP_IPV4) != 0) 1476 in6p->inp_ip_ttl = optval; 1477 } 1478 break; 1479 #define OPTSET(bit) \ 1480 do { \ 1481 if (optval) \ 1482 in6p->inp_flags |= (bit); \ 1483 else \ 1484 in6p->inp_flags &= ~(bit); \ 1485 } while (/*CONSTCOND*/ 0) 1486 #define OPTSET2292(bit) \ 1487 do { \ 1488 in6p->inp_flags |= IN6P_RFC2292; \ 1489 if (optval) \ 1490 in6p->inp_flags |= (bit); \ 1491 else \ 1492 in6p->inp_flags &= ~(bit); \ 1493 } while (/*CONSTCOND*/ 0) 1494 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1495 1496 case IPV6_RECVPKTINFO: 1497 /* cannot mix with RFC2292 */ 1498 if (OPTBIT(IN6P_RFC2292)) { 1499 error = EINVAL; 1500 break; 1501 } 1502 OPTSET(IN6P_PKTINFO); 1503 break; 1504 1505 case IPV6_HOPLIMIT: 1506 { 1507 struct ip6_pktopts **optp; 1508 1509 /* cannot mix with RFC2292 */ 1510 if (OPTBIT(IN6P_RFC2292)) { 1511 error = EINVAL; 1512 break; 1513 } 1514 optp = &in6p->in6p_outputopts; 1515 error = ip6_pcbopt(IPV6_HOPLIMIT, 1516 (u_char *)&optval, sizeof(optval), 1517 optp, (td != NULL) ? td->td_ucred : 1518 NULL, uproto); 1519 break; 1520 } 1521 1522 case IPV6_RECVHOPLIMIT: 1523 /* cannot mix with RFC2292 */ 1524 if (OPTBIT(IN6P_RFC2292)) { 1525 error = EINVAL; 1526 break; 1527 } 1528 OPTSET(IN6P_HOPLIMIT); 1529 break; 1530 1531 case IPV6_RECVHOPOPTS: 1532 /* cannot mix with RFC2292 */ 1533 if (OPTBIT(IN6P_RFC2292)) { 1534 error = EINVAL; 1535 break; 1536 } 1537 OPTSET(IN6P_HOPOPTS); 1538 break; 1539 1540 case IPV6_RECVDSTOPTS: 1541 /* cannot mix with RFC2292 */ 1542 if (OPTBIT(IN6P_RFC2292)) { 1543 error = EINVAL; 1544 break; 1545 } 1546 OPTSET(IN6P_DSTOPTS); 1547 break; 1548 1549 case IPV6_RECVRTHDRDSTOPTS: 1550 /* cannot mix with RFC2292 */ 1551 if (OPTBIT(IN6P_RFC2292)) { 1552 error = EINVAL; 1553 break; 1554 } 1555 OPTSET(IN6P_RTHDRDSTOPTS); 1556 break; 1557 1558 case IPV6_RECVRTHDR: 1559 /* cannot mix with RFC2292 */ 1560 if (OPTBIT(IN6P_RFC2292)) { 1561 error = EINVAL; 1562 break; 1563 } 1564 OPTSET(IN6P_RTHDR); 1565 break; 1566 1567 case IPV6_FAITH: 1568 OPTSET(INP_FAITH); 1569 break; 1570 1571 case IPV6_RECVPATHMTU: 1572 /* 1573 * We ignore this option for TCP 1574 * sockets. 1575 * (RFC3542 leaves this case 1576 * unspecified.) 1577 */ 1578 if (uproto != IPPROTO_TCP) 1579 OPTSET(IN6P_MTU); 1580 break; 1581 1582 case IPV6_V6ONLY: 1583 /* 1584 * make setsockopt(IPV6_V6ONLY) 1585 * available only prior to bind(2). 1586 * see ipng mailing list, Jun 22 2001. 1587 */ 1588 if (in6p->inp_lport || 1589 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1590 error = EINVAL; 1591 break; 1592 } 1593 OPTSET(IN6P_IPV6_V6ONLY); 1594 if (optval) 1595 in6p->inp_vflag &= ~INP_IPV4; 1596 else 1597 in6p->inp_vflag |= INP_IPV4; 1598 break; 1599 case IPV6_RECVTCLASS: 1600 /* cannot mix with RFC2292 XXX */ 1601 if (OPTBIT(IN6P_RFC2292)) { 1602 error = EINVAL; 1603 break; 1604 } 1605 OPTSET(IN6P_TCLASS); 1606 break; 1607 case IPV6_AUTOFLOWLABEL: 1608 OPTSET(IN6P_AUTOFLOWLABEL); 1609 break; 1610 1611 case IPV6_BINDANY: 1612 OPTSET(INP_BINDANY); 1613 break; 1614 } 1615 break; 1616 1617 case IPV6_TCLASS: 1618 case IPV6_DONTFRAG: 1619 case IPV6_USE_MIN_MTU: 1620 case IPV6_PREFER_TEMPADDR: 1621 if (optlen != sizeof(optval)) { 1622 error = EINVAL; 1623 break; 1624 } 1625 error = sooptcopyin(sopt, &optval, 1626 sizeof optval, sizeof optval); 1627 if (error) 1628 break; 1629 { 1630 struct ip6_pktopts **optp; 1631 optp = &in6p->in6p_outputopts; 1632 error = ip6_pcbopt(optname, 1633 (u_char *)&optval, sizeof(optval), 1634 optp, (td != NULL) ? td->td_ucred : 1635 NULL, uproto); 1636 break; 1637 } 1638 1639 case IPV6_2292PKTINFO: 1640 case IPV6_2292HOPLIMIT: 1641 case IPV6_2292HOPOPTS: 1642 case IPV6_2292DSTOPTS: 1643 case IPV6_2292RTHDR: 1644 /* RFC 2292 */ 1645 if (optlen != sizeof(int)) { 1646 error = EINVAL; 1647 break; 1648 } 1649 error = sooptcopyin(sopt, &optval, 1650 sizeof optval, sizeof optval); 1651 if (error) 1652 break; 1653 switch (optname) { 1654 case IPV6_2292PKTINFO: 1655 OPTSET2292(IN6P_PKTINFO); 1656 break; 1657 case IPV6_2292HOPLIMIT: 1658 OPTSET2292(IN6P_HOPLIMIT); 1659 break; 1660 case IPV6_2292HOPOPTS: 1661 /* 1662 * Check super-user privilege. 1663 * See comments for IPV6_RECVHOPOPTS. 1664 */ 1665 if (td != NULL) { 1666 error = priv_check(td, 1667 PRIV_NETINET_SETHDROPTS); 1668 if (error) 1669 return (error); 1670 } 1671 OPTSET2292(IN6P_HOPOPTS); 1672 break; 1673 case IPV6_2292DSTOPTS: 1674 if (td != NULL) { 1675 error = priv_check(td, 1676 PRIV_NETINET_SETHDROPTS); 1677 if (error) 1678 return (error); 1679 } 1680 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1681 break; 1682 case IPV6_2292RTHDR: 1683 OPTSET2292(IN6P_RTHDR); 1684 break; 1685 } 1686 break; 1687 case IPV6_PKTINFO: 1688 case IPV6_HOPOPTS: 1689 case IPV6_RTHDR: 1690 case IPV6_DSTOPTS: 1691 case IPV6_RTHDRDSTOPTS: 1692 case IPV6_NEXTHOP: 1693 { 1694 /* new advanced API (RFC3542) */ 1695 u_char *optbuf; 1696 u_char optbuf_storage[MCLBYTES]; 1697 int optlen; 1698 struct ip6_pktopts **optp; 1699 1700 /* cannot mix with RFC2292 */ 1701 if (OPTBIT(IN6P_RFC2292)) { 1702 error = EINVAL; 1703 break; 1704 } 1705 1706 /* 1707 * We only ensure valsize is not too large 1708 * here. Further validation will be done 1709 * later. 1710 */ 1711 error = sooptcopyin(sopt, optbuf_storage, 1712 sizeof(optbuf_storage), 0); 1713 if (error) 1714 break; 1715 optlen = sopt->sopt_valsize; 1716 optbuf = optbuf_storage; 1717 optp = &in6p->in6p_outputopts; 1718 error = ip6_pcbopt(optname, optbuf, optlen, 1719 optp, (td != NULL) ? td->td_ucred : NULL, 1720 uproto); 1721 break; 1722 } 1723 #undef OPTSET 1724 1725 case IPV6_MULTICAST_IF: 1726 case IPV6_MULTICAST_HOPS: 1727 case IPV6_MULTICAST_LOOP: 1728 case IPV6_JOIN_GROUP: 1729 case IPV6_LEAVE_GROUP: 1730 case IPV6_MSFILTER: 1731 case MCAST_BLOCK_SOURCE: 1732 case MCAST_UNBLOCK_SOURCE: 1733 case MCAST_JOIN_GROUP: 1734 case MCAST_LEAVE_GROUP: 1735 case MCAST_JOIN_SOURCE_GROUP: 1736 case MCAST_LEAVE_SOURCE_GROUP: 1737 error = ip6_setmoptions(in6p, sopt); 1738 break; 1739 1740 case IPV6_PORTRANGE: 1741 error = sooptcopyin(sopt, &optval, 1742 sizeof optval, sizeof optval); 1743 if (error) 1744 break; 1745 1746 switch (optval) { 1747 case IPV6_PORTRANGE_DEFAULT: 1748 in6p->inp_flags &= ~(INP_LOWPORT); 1749 in6p->inp_flags &= ~(INP_HIGHPORT); 1750 break; 1751 1752 case IPV6_PORTRANGE_HIGH: 1753 in6p->inp_flags &= ~(INP_LOWPORT); 1754 in6p->inp_flags |= INP_HIGHPORT; 1755 break; 1756 1757 case IPV6_PORTRANGE_LOW: 1758 in6p->inp_flags &= ~(INP_HIGHPORT); 1759 in6p->inp_flags |= INP_LOWPORT; 1760 break; 1761 1762 default: 1763 error = EINVAL; 1764 break; 1765 } 1766 break; 1767 1768 #ifdef IPSEC 1769 case IPV6_IPSEC_POLICY: 1770 { 1771 caddr_t req; 1772 struct mbuf *m; 1773 1774 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1775 break; 1776 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1777 break; 1778 req = mtod(m, caddr_t); 1779 error = ipsec_set_policy(in6p, optname, req, 1780 m->m_len, (sopt->sopt_td != NULL) ? 1781 sopt->sopt_td->td_ucred : NULL); 1782 m_freem(m); 1783 break; 1784 } 1785 #endif /* IPSEC */ 1786 1787 default: 1788 error = ENOPROTOOPT; 1789 break; 1790 } 1791 break; 1792 1793 case SOPT_GET: 1794 switch (optname) { 1795 1796 case IPV6_2292PKTOPTIONS: 1797 #ifdef IPV6_PKTOPTIONS 1798 case IPV6_PKTOPTIONS: 1799 #endif 1800 /* 1801 * RFC3542 (effectively) deprecated the 1802 * semantics of the 2292-style pktoptions. 1803 * Since it was not reliable in nature (i.e., 1804 * applications had to expect the lack of some 1805 * information after all), it would make sense 1806 * to simplify this part by always returning 1807 * empty data. 1808 */ 1809 sopt->sopt_valsize = 0; 1810 break; 1811 1812 case IPV6_RECVHOPOPTS: 1813 case IPV6_RECVDSTOPTS: 1814 case IPV6_RECVRTHDRDSTOPTS: 1815 case IPV6_UNICAST_HOPS: 1816 case IPV6_RECVPKTINFO: 1817 case IPV6_RECVHOPLIMIT: 1818 case IPV6_RECVRTHDR: 1819 case IPV6_RECVPATHMTU: 1820 1821 case IPV6_FAITH: 1822 case IPV6_V6ONLY: 1823 case IPV6_PORTRANGE: 1824 case IPV6_RECVTCLASS: 1825 case IPV6_AUTOFLOWLABEL: 1826 switch (optname) { 1827 1828 case IPV6_RECVHOPOPTS: 1829 optval = OPTBIT(IN6P_HOPOPTS); 1830 break; 1831 1832 case IPV6_RECVDSTOPTS: 1833 optval = OPTBIT(IN6P_DSTOPTS); 1834 break; 1835 1836 case IPV6_RECVRTHDRDSTOPTS: 1837 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1838 break; 1839 1840 case IPV6_UNICAST_HOPS: 1841 optval = in6p->in6p_hops; 1842 break; 1843 1844 case IPV6_RECVPKTINFO: 1845 optval = OPTBIT(IN6P_PKTINFO); 1846 break; 1847 1848 case IPV6_RECVHOPLIMIT: 1849 optval = OPTBIT(IN6P_HOPLIMIT); 1850 break; 1851 1852 case IPV6_RECVRTHDR: 1853 optval = OPTBIT(IN6P_RTHDR); 1854 break; 1855 1856 case IPV6_RECVPATHMTU: 1857 optval = OPTBIT(IN6P_MTU); 1858 break; 1859 1860 case IPV6_FAITH: 1861 optval = OPTBIT(INP_FAITH); 1862 break; 1863 1864 case IPV6_V6ONLY: 1865 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1866 break; 1867 1868 case IPV6_PORTRANGE: 1869 { 1870 int flags; 1871 flags = in6p->inp_flags; 1872 if (flags & INP_HIGHPORT) 1873 optval = IPV6_PORTRANGE_HIGH; 1874 else if (flags & INP_LOWPORT) 1875 optval = IPV6_PORTRANGE_LOW; 1876 else 1877 optval = 0; 1878 break; 1879 } 1880 case IPV6_RECVTCLASS: 1881 optval = OPTBIT(IN6P_TCLASS); 1882 break; 1883 1884 case IPV6_AUTOFLOWLABEL: 1885 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1886 break; 1887 1888 case IPV6_BINDANY: 1889 optval = OPTBIT(INP_BINDANY); 1890 break; 1891 } 1892 if (error) 1893 break; 1894 error = sooptcopyout(sopt, &optval, 1895 sizeof optval); 1896 break; 1897 1898 case IPV6_PATHMTU: 1899 { 1900 u_long pmtu = 0; 1901 struct ip6_mtuinfo mtuinfo; 1902 struct route_in6 sro; 1903 1904 bzero(&sro, sizeof(sro)); 1905 1906 if (!(so->so_state & SS_ISCONNECTED)) 1907 return (ENOTCONN); 1908 /* 1909 * XXX: we dot not consider the case of source 1910 * routing, or optional information to specify 1911 * the outgoing interface. 1912 */ 1913 error = ip6_getpmtu(&sro, NULL, NULL, 1914 &in6p->in6p_faddr, &pmtu, NULL); 1915 if (sro.ro_rt) 1916 RTFREE(sro.ro_rt); 1917 if (error) 1918 break; 1919 if (pmtu > IPV6_MAXPACKET) 1920 pmtu = IPV6_MAXPACKET; 1921 1922 bzero(&mtuinfo, sizeof(mtuinfo)); 1923 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1924 optdata = (void *)&mtuinfo; 1925 optdatalen = sizeof(mtuinfo); 1926 error = sooptcopyout(sopt, optdata, 1927 optdatalen); 1928 break; 1929 } 1930 1931 case IPV6_2292PKTINFO: 1932 case IPV6_2292HOPLIMIT: 1933 case IPV6_2292HOPOPTS: 1934 case IPV6_2292RTHDR: 1935 case IPV6_2292DSTOPTS: 1936 switch (optname) { 1937 case IPV6_2292PKTINFO: 1938 optval = OPTBIT(IN6P_PKTINFO); 1939 break; 1940 case IPV6_2292HOPLIMIT: 1941 optval = OPTBIT(IN6P_HOPLIMIT); 1942 break; 1943 case IPV6_2292HOPOPTS: 1944 optval = OPTBIT(IN6P_HOPOPTS); 1945 break; 1946 case IPV6_2292RTHDR: 1947 optval = OPTBIT(IN6P_RTHDR); 1948 break; 1949 case IPV6_2292DSTOPTS: 1950 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1951 break; 1952 } 1953 error = sooptcopyout(sopt, &optval, 1954 sizeof optval); 1955 break; 1956 case IPV6_PKTINFO: 1957 case IPV6_HOPOPTS: 1958 case IPV6_RTHDR: 1959 case IPV6_DSTOPTS: 1960 case IPV6_RTHDRDSTOPTS: 1961 case IPV6_NEXTHOP: 1962 case IPV6_TCLASS: 1963 case IPV6_DONTFRAG: 1964 case IPV6_USE_MIN_MTU: 1965 case IPV6_PREFER_TEMPADDR: 1966 error = ip6_getpcbopt(in6p->in6p_outputopts, 1967 optname, sopt); 1968 break; 1969 1970 case IPV6_MULTICAST_IF: 1971 case IPV6_MULTICAST_HOPS: 1972 case IPV6_MULTICAST_LOOP: 1973 case IPV6_MSFILTER: 1974 error = ip6_getmoptions(in6p, sopt); 1975 break; 1976 1977 #ifdef IPSEC 1978 case IPV6_IPSEC_POLICY: 1979 { 1980 caddr_t req = NULL; 1981 size_t len = 0; 1982 struct mbuf *m = NULL; 1983 struct mbuf **mp = &m; 1984 size_t ovalsize = sopt->sopt_valsize; 1985 caddr_t oval = (caddr_t)sopt->sopt_val; 1986 1987 error = soopt_getm(sopt, &m); /* XXX */ 1988 if (error != 0) 1989 break; 1990 error = soopt_mcopyin(sopt, m); /* XXX */ 1991 if (error != 0) 1992 break; 1993 sopt->sopt_valsize = ovalsize; 1994 sopt->sopt_val = oval; 1995 if (m) { 1996 req = mtod(m, caddr_t); 1997 len = m->m_len; 1998 } 1999 error = ipsec_get_policy(in6p, req, len, mp); 2000 if (error == 0) 2001 error = soopt_mcopyout(sopt, m); /* XXX */ 2002 if (error == 0 && m) 2003 m_freem(m); 2004 break; 2005 } 2006 #endif /* IPSEC */ 2007 2008 default: 2009 error = ENOPROTOOPT; 2010 break; 2011 } 2012 break; 2013 } 2014 } else { /* level != IPPROTO_IPV6 */ 2015 error = EINVAL; 2016 } 2017 return (error); 2018 } 2019 2020 int 2021 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2022 { 2023 int error = 0, optval, optlen; 2024 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2025 struct inpcb *in6p = sotoinpcb(so); 2026 int level, op, optname; 2027 2028 level = sopt->sopt_level; 2029 op = sopt->sopt_dir; 2030 optname = sopt->sopt_name; 2031 optlen = sopt->sopt_valsize; 2032 2033 if (level != IPPROTO_IPV6) { 2034 return (EINVAL); 2035 } 2036 2037 switch (optname) { 2038 case IPV6_CHECKSUM: 2039 /* 2040 * For ICMPv6 sockets, no modification allowed for checksum 2041 * offset, permit "no change" values to help existing apps. 2042 * 2043 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2044 * for an ICMPv6 socket will fail." 2045 * The current behavior does not meet RFC3542. 2046 */ 2047 switch (op) { 2048 case SOPT_SET: 2049 if (optlen != sizeof(int)) { 2050 error = EINVAL; 2051 break; 2052 } 2053 error = sooptcopyin(sopt, &optval, sizeof(optval), 2054 sizeof(optval)); 2055 if (error) 2056 break; 2057 if ((optval % 2) != 0) { 2058 /* the API assumes even offset values */ 2059 error = EINVAL; 2060 } else if (so->so_proto->pr_protocol == 2061 IPPROTO_ICMPV6) { 2062 if (optval != icmp6off) 2063 error = EINVAL; 2064 } else 2065 in6p->in6p_cksum = optval; 2066 break; 2067 2068 case SOPT_GET: 2069 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2070 optval = icmp6off; 2071 else 2072 optval = in6p->in6p_cksum; 2073 2074 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2075 break; 2076 2077 default: 2078 error = EINVAL; 2079 break; 2080 } 2081 break; 2082 2083 default: 2084 error = ENOPROTOOPT; 2085 break; 2086 } 2087 2088 return (error); 2089 } 2090 2091 /* 2092 * Set up IP6 options in pcb for insertion in output packets or 2093 * specifying behavior of outgoing packets. 2094 */ 2095 static int 2096 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2097 struct socket *so, struct sockopt *sopt) 2098 { 2099 struct ip6_pktopts *opt = *pktopt; 2100 int error = 0; 2101 struct thread *td = sopt->sopt_td; 2102 2103 /* turn off any old options. */ 2104 if (opt) { 2105 #ifdef DIAGNOSTIC 2106 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2107 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2108 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2109 printf("ip6_pcbopts: all specified options are cleared.\n"); 2110 #endif 2111 ip6_clearpktopts(opt, -1); 2112 } else 2113 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2114 *pktopt = NULL; 2115 2116 if (!m || m->m_len == 0) { 2117 /* 2118 * Only turning off any previous options, regardless of 2119 * whether the opt is just created or given. 2120 */ 2121 free(opt, M_IP6OPT); 2122 return (0); 2123 } 2124 2125 /* set options specified by user. */ 2126 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2127 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2128 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2129 free(opt, M_IP6OPT); 2130 return (error); 2131 } 2132 *pktopt = opt; 2133 return (0); 2134 } 2135 2136 /* 2137 * initialize ip6_pktopts. beware that there are non-zero default values in 2138 * the struct. 2139 */ 2140 void 2141 ip6_initpktopts(struct ip6_pktopts *opt) 2142 { 2143 2144 bzero(opt, sizeof(*opt)); 2145 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2146 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2147 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2148 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2149 } 2150 2151 static int 2152 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2153 struct ucred *cred, int uproto) 2154 { 2155 struct ip6_pktopts *opt; 2156 2157 if (*pktopt == NULL) { 2158 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2159 M_WAITOK); 2160 ip6_initpktopts(*pktopt); 2161 } 2162 opt = *pktopt; 2163 2164 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2165 } 2166 2167 static int 2168 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2169 { 2170 void *optdata = NULL; 2171 int optdatalen = 0; 2172 struct ip6_ext *ip6e; 2173 int error = 0; 2174 struct in6_pktinfo null_pktinfo; 2175 int deftclass = 0, on; 2176 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2177 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2178 2179 switch (optname) { 2180 case IPV6_PKTINFO: 2181 if (pktopt && pktopt->ip6po_pktinfo) 2182 optdata = (void *)pktopt->ip6po_pktinfo; 2183 else { 2184 /* XXX: we don't have to do this every time... */ 2185 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2186 optdata = (void *)&null_pktinfo; 2187 } 2188 optdatalen = sizeof(struct in6_pktinfo); 2189 break; 2190 case IPV6_TCLASS: 2191 if (pktopt && pktopt->ip6po_tclass >= 0) 2192 optdata = (void *)&pktopt->ip6po_tclass; 2193 else 2194 optdata = (void *)&deftclass; 2195 optdatalen = sizeof(int); 2196 break; 2197 case IPV6_HOPOPTS: 2198 if (pktopt && pktopt->ip6po_hbh) { 2199 optdata = (void *)pktopt->ip6po_hbh; 2200 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2201 optdatalen = (ip6e->ip6e_len + 1) << 3; 2202 } 2203 break; 2204 case IPV6_RTHDR: 2205 if (pktopt && pktopt->ip6po_rthdr) { 2206 optdata = (void *)pktopt->ip6po_rthdr; 2207 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2208 optdatalen = (ip6e->ip6e_len + 1) << 3; 2209 } 2210 break; 2211 case IPV6_RTHDRDSTOPTS: 2212 if (pktopt && pktopt->ip6po_dest1) { 2213 optdata = (void *)pktopt->ip6po_dest1; 2214 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2215 optdatalen = (ip6e->ip6e_len + 1) << 3; 2216 } 2217 break; 2218 case IPV6_DSTOPTS: 2219 if (pktopt && pktopt->ip6po_dest2) { 2220 optdata = (void *)pktopt->ip6po_dest2; 2221 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2222 optdatalen = (ip6e->ip6e_len + 1) << 3; 2223 } 2224 break; 2225 case IPV6_NEXTHOP: 2226 if (pktopt && pktopt->ip6po_nexthop) { 2227 optdata = (void *)pktopt->ip6po_nexthop; 2228 optdatalen = pktopt->ip6po_nexthop->sa_len; 2229 } 2230 break; 2231 case IPV6_USE_MIN_MTU: 2232 if (pktopt) 2233 optdata = (void *)&pktopt->ip6po_minmtu; 2234 else 2235 optdata = (void *)&defminmtu; 2236 optdatalen = sizeof(int); 2237 break; 2238 case IPV6_DONTFRAG: 2239 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2240 on = 1; 2241 else 2242 on = 0; 2243 optdata = (void *)&on; 2244 optdatalen = sizeof(on); 2245 break; 2246 case IPV6_PREFER_TEMPADDR: 2247 if (pktopt) 2248 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2249 else 2250 optdata = (void *)&defpreftemp; 2251 optdatalen = sizeof(int); 2252 break; 2253 default: /* should not happen */ 2254 #ifdef DIAGNOSTIC 2255 panic("ip6_getpcbopt: unexpected option\n"); 2256 #endif 2257 return (ENOPROTOOPT); 2258 } 2259 2260 error = sooptcopyout(sopt, optdata, optdatalen); 2261 2262 return (error); 2263 } 2264 2265 void 2266 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2267 { 2268 if (pktopt == NULL) 2269 return; 2270 2271 if (optname == -1 || optname == IPV6_PKTINFO) { 2272 if (pktopt->ip6po_pktinfo) 2273 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2274 pktopt->ip6po_pktinfo = NULL; 2275 } 2276 if (optname == -1 || optname == IPV6_HOPLIMIT) 2277 pktopt->ip6po_hlim = -1; 2278 if (optname == -1 || optname == IPV6_TCLASS) 2279 pktopt->ip6po_tclass = -1; 2280 if (optname == -1 || optname == IPV6_NEXTHOP) { 2281 if (pktopt->ip6po_nextroute.ro_rt) { 2282 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2283 pktopt->ip6po_nextroute.ro_rt = NULL; 2284 } 2285 if (pktopt->ip6po_nexthop) 2286 free(pktopt->ip6po_nexthop, M_IP6OPT); 2287 pktopt->ip6po_nexthop = NULL; 2288 } 2289 if (optname == -1 || optname == IPV6_HOPOPTS) { 2290 if (pktopt->ip6po_hbh) 2291 free(pktopt->ip6po_hbh, M_IP6OPT); 2292 pktopt->ip6po_hbh = NULL; 2293 } 2294 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2295 if (pktopt->ip6po_dest1) 2296 free(pktopt->ip6po_dest1, M_IP6OPT); 2297 pktopt->ip6po_dest1 = NULL; 2298 } 2299 if (optname == -1 || optname == IPV6_RTHDR) { 2300 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2301 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2302 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2303 if (pktopt->ip6po_route.ro_rt) { 2304 RTFREE(pktopt->ip6po_route.ro_rt); 2305 pktopt->ip6po_route.ro_rt = NULL; 2306 } 2307 } 2308 if (optname == -1 || optname == IPV6_DSTOPTS) { 2309 if (pktopt->ip6po_dest2) 2310 free(pktopt->ip6po_dest2, M_IP6OPT); 2311 pktopt->ip6po_dest2 = NULL; 2312 } 2313 } 2314 2315 #define PKTOPT_EXTHDRCPY(type) \ 2316 do {\ 2317 if (src->type) {\ 2318 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2319 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2320 if (dst->type == NULL && canwait == M_NOWAIT)\ 2321 goto bad;\ 2322 bcopy(src->type, dst->type, hlen);\ 2323 }\ 2324 } while (/*CONSTCOND*/ 0) 2325 2326 static int 2327 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2328 { 2329 if (dst == NULL || src == NULL) { 2330 printf("ip6_clearpktopts: invalid argument\n"); 2331 return (EINVAL); 2332 } 2333 2334 dst->ip6po_hlim = src->ip6po_hlim; 2335 dst->ip6po_tclass = src->ip6po_tclass; 2336 dst->ip6po_flags = src->ip6po_flags; 2337 if (src->ip6po_pktinfo) { 2338 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2339 M_IP6OPT, canwait); 2340 if (dst->ip6po_pktinfo == NULL) 2341 goto bad; 2342 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2343 } 2344 if (src->ip6po_nexthop) { 2345 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2346 M_IP6OPT, canwait); 2347 if (dst->ip6po_nexthop == NULL) 2348 goto bad; 2349 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2350 src->ip6po_nexthop->sa_len); 2351 } 2352 PKTOPT_EXTHDRCPY(ip6po_hbh); 2353 PKTOPT_EXTHDRCPY(ip6po_dest1); 2354 PKTOPT_EXTHDRCPY(ip6po_dest2); 2355 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2356 return (0); 2357 2358 bad: 2359 ip6_clearpktopts(dst, -1); 2360 return (ENOBUFS); 2361 } 2362 #undef PKTOPT_EXTHDRCPY 2363 2364 struct ip6_pktopts * 2365 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2366 { 2367 int error; 2368 struct ip6_pktopts *dst; 2369 2370 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2371 if (dst == NULL) 2372 return (NULL); 2373 ip6_initpktopts(dst); 2374 2375 if ((error = copypktopts(dst, src, canwait)) != 0) { 2376 free(dst, M_IP6OPT); 2377 return (NULL); 2378 } 2379 2380 return (dst); 2381 } 2382 2383 void 2384 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2385 { 2386 if (pktopt == NULL) 2387 return; 2388 2389 ip6_clearpktopts(pktopt, -1); 2390 2391 free(pktopt, M_IP6OPT); 2392 } 2393 2394 /* 2395 * Set IPv6 outgoing packet options based on advanced API. 2396 */ 2397 int 2398 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2399 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2400 { 2401 struct cmsghdr *cm = 0; 2402 2403 if (control == NULL || opt == NULL) 2404 return (EINVAL); 2405 2406 ip6_initpktopts(opt); 2407 if (stickyopt) { 2408 int error; 2409 2410 /* 2411 * If stickyopt is provided, make a local copy of the options 2412 * for this particular packet, then override them by ancillary 2413 * objects. 2414 * XXX: copypktopts() does not copy the cached route to a next 2415 * hop (if any). This is not very good in terms of efficiency, 2416 * but we can allow this since this option should be rarely 2417 * used. 2418 */ 2419 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2420 return (error); 2421 } 2422 2423 /* 2424 * XXX: Currently, we assume all the optional information is stored 2425 * in a single mbuf. 2426 */ 2427 if (control->m_next) 2428 return (EINVAL); 2429 2430 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2431 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2432 int error; 2433 2434 if (control->m_len < CMSG_LEN(0)) 2435 return (EINVAL); 2436 2437 cm = mtod(control, struct cmsghdr *); 2438 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2439 return (EINVAL); 2440 if (cm->cmsg_level != IPPROTO_IPV6) 2441 continue; 2442 2443 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2444 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2445 if (error) 2446 return (error); 2447 } 2448 2449 return (0); 2450 } 2451 2452 /* 2453 * Set a particular packet option, as a sticky option or an ancillary data 2454 * item. "len" can be 0 only when it's a sticky option. 2455 * We have 4 cases of combination of "sticky" and "cmsg": 2456 * "sticky=0, cmsg=0": impossible 2457 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2458 * "sticky=1, cmsg=0": RFC3542 socket option 2459 * "sticky=1, cmsg=1": RFC2292 socket option 2460 */ 2461 static int 2462 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2463 struct ucred *cred, int sticky, int cmsg, int uproto) 2464 { 2465 int minmtupolicy, preftemp; 2466 int error; 2467 2468 if (!sticky && !cmsg) { 2469 #ifdef DIAGNOSTIC 2470 printf("ip6_setpktopt: impossible case\n"); 2471 #endif 2472 return (EINVAL); 2473 } 2474 2475 /* 2476 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2477 * not be specified in the context of RFC3542. Conversely, 2478 * RFC3542 types should not be specified in the context of RFC2292. 2479 */ 2480 if (!cmsg) { 2481 switch (optname) { 2482 case IPV6_2292PKTINFO: 2483 case IPV6_2292HOPLIMIT: 2484 case IPV6_2292NEXTHOP: 2485 case IPV6_2292HOPOPTS: 2486 case IPV6_2292DSTOPTS: 2487 case IPV6_2292RTHDR: 2488 case IPV6_2292PKTOPTIONS: 2489 return (ENOPROTOOPT); 2490 } 2491 } 2492 if (sticky && cmsg) { 2493 switch (optname) { 2494 case IPV6_PKTINFO: 2495 case IPV6_HOPLIMIT: 2496 case IPV6_NEXTHOP: 2497 case IPV6_HOPOPTS: 2498 case IPV6_DSTOPTS: 2499 case IPV6_RTHDRDSTOPTS: 2500 case IPV6_RTHDR: 2501 case IPV6_USE_MIN_MTU: 2502 case IPV6_DONTFRAG: 2503 case IPV6_TCLASS: 2504 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2505 return (ENOPROTOOPT); 2506 } 2507 } 2508 2509 switch (optname) { 2510 case IPV6_2292PKTINFO: 2511 case IPV6_PKTINFO: 2512 { 2513 struct ifnet *ifp = NULL; 2514 struct in6_pktinfo *pktinfo; 2515 2516 if (len != sizeof(struct in6_pktinfo)) 2517 return (EINVAL); 2518 2519 pktinfo = (struct in6_pktinfo *)buf; 2520 2521 /* 2522 * An application can clear any sticky IPV6_PKTINFO option by 2523 * doing a "regular" setsockopt with ipi6_addr being 2524 * in6addr_any and ipi6_ifindex being zero. 2525 * [RFC 3542, Section 6] 2526 */ 2527 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2528 pktinfo->ipi6_ifindex == 0 && 2529 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2530 ip6_clearpktopts(opt, optname); 2531 break; 2532 } 2533 2534 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2535 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2536 return (EINVAL); 2537 } 2538 2539 /* validate the interface index if specified. */ 2540 if (pktinfo->ipi6_ifindex > V_if_index || 2541 pktinfo->ipi6_ifindex < 0) { 2542 return (ENXIO); 2543 } 2544 if (pktinfo->ipi6_ifindex) { 2545 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2546 if (ifp == NULL) 2547 return (ENXIO); 2548 } 2549 2550 /* 2551 * We store the address anyway, and let in6_selectsrc() 2552 * validate the specified address. This is because ipi6_addr 2553 * may not have enough information about its scope zone, and 2554 * we may need additional information (such as outgoing 2555 * interface or the scope zone of a destination address) to 2556 * disambiguate the scope. 2557 * XXX: the delay of the validation may confuse the 2558 * application when it is used as a sticky option. 2559 */ 2560 if (opt->ip6po_pktinfo == NULL) { 2561 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2562 M_IP6OPT, M_NOWAIT); 2563 if (opt->ip6po_pktinfo == NULL) 2564 return (ENOBUFS); 2565 } 2566 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2567 break; 2568 } 2569 2570 case IPV6_2292HOPLIMIT: 2571 case IPV6_HOPLIMIT: 2572 { 2573 int *hlimp; 2574 2575 /* 2576 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2577 * to simplify the ordering among hoplimit options. 2578 */ 2579 if (optname == IPV6_HOPLIMIT && sticky) 2580 return (ENOPROTOOPT); 2581 2582 if (len != sizeof(int)) 2583 return (EINVAL); 2584 hlimp = (int *)buf; 2585 if (*hlimp < -1 || *hlimp > 255) 2586 return (EINVAL); 2587 2588 opt->ip6po_hlim = *hlimp; 2589 break; 2590 } 2591 2592 case IPV6_TCLASS: 2593 { 2594 int tclass; 2595 2596 if (len != sizeof(int)) 2597 return (EINVAL); 2598 tclass = *(int *)buf; 2599 if (tclass < -1 || tclass > 255) 2600 return (EINVAL); 2601 2602 opt->ip6po_tclass = tclass; 2603 break; 2604 } 2605 2606 case IPV6_2292NEXTHOP: 2607 case IPV6_NEXTHOP: 2608 if (cred != NULL) { 2609 error = priv_check_cred(cred, 2610 PRIV_NETINET_SETHDROPTS, 0); 2611 if (error) 2612 return (error); 2613 } 2614 2615 if (len == 0) { /* just remove the option */ 2616 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2617 break; 2618 } 2619 2620 /* check if cmsg_len is large enough for sa_len */ 2621 if (len < sizeof(struct sockaddr) || len < *buf) 2622 return (EINVAL); 2623 2624 switch (((struct sockaddr *)buf)->sa_family) { 2625 case AF_INET6: 2626 { 2627 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2628 int error; 2629 2630 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2631 return (EINVAL); 2632 2633 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2634 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2635 return (EINVAL); 2636 } 2637 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2638 != 0) { 2639 return (error); 2640 } 2641 break; 2642 } 2643 case AF_LINK: /* should eventually be supported */ 2644 default: 2645 return (EAFNOSUPPORT); 2646 } 2647 2648 /* turn off the previous option, then set the new option. */ 2649 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2650 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2651 if (opt->ip6po_nexthop == NULL) 2652 return (ENOBUFS); 2653 bcopy(buf, opt->ip6po_nexthop, *buf); 2654 break; 2655 2656 case IPV6_2292HOPOPTS: 2657 case IPV6_HOPOPTS: 2658 { 2659 struct ip6_hbh *hbh; 2660 int hbhlen; 2661 2662 /* 2663 * XXX: We don't allow a non-privileged user to set ANY HbH 2664 * options, since per-option restriction has too much 2665 * overhead. 2666 */ 2667 if (cred != NULL) { 2668 error = priv_check_cred(cred, 2669 PRIV_NETINET_SETHDROPTS, 0); 2670 if (error) 2671 return (error); 2672 } 2673 2674 if (len == 0) { 2675 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2676 break; /* just remove the option */ 2677 } 2678 2679 /* message length validation */ 2680 if (len < sizeof(struct ip6_hbh)) 2681 return (EINVAL); 2682 hbh = (struct ip6_hbh *)buf; 2683 hbhlen = (hbh->ip6h_len + 1) << 3; 2684 if (len != hbhlen) 2685 return (EINVAL); 2686 2687 /* turn off the previous option, then set the new option. */ 2688 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2689 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2690 if (opt->ip6po_hbh == NULL) 2691 return (ENOBUFS); 2692 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2693 2694 break; 2695 } 2696 2697 case IPV6_2292DSTOPTS: 2698 case IPV6_DSTOPTS: 2699 case IPV6_RTHDRDSTOPTS: 2700 { 2701 struct ip6_dest *dest, **newdest = NULL; 2702 int destlen; 2703 2704 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2705 error = priv_check_cred(cred, 2706 PRIV_NETINET_SETHDROPTS, 0); 2707 if (error) 2708 return (error); 2709 } 2710 2711 if (len == 0) { 2712 ip6_clearpktopts(opt, optname); 2713 break; /* just remove the option */ 2714 } 2715 2716 /* message length validation */ 2717 if (len < sizeof(struct ip6_dest)) 2718 return (EINVAL); 2719 dest = (struct ip6_dest *)buf; 2720 destlen = (dest->ip6d_len + 1) << 3; 2721 if (len != destlen) 2722 return (EINVAL); 2723 2724 /* 2725 * Determine the position that the destination options header 2726 * should be inserted; before or after the routing header. 2727 */ 2728 switch (optname) { 2729 case IPV6_2292DSTOPTS: 2730 /* 2731 * The old advacned API is ambiguous on this point. 2732 * Our approach is to determine the position based 2733 * according to the existence of a routing header. 2734 * Note, however, that this depends on the order of the 2735 * extension headers in the ancillary data; the 1st 2736 * part of the destination options header must appear 2737 * before the routing header in the ancillary data, 2738 * too. 2739 * RFC3542 solved the ambiguity by introducing 2740 * separate ancillary data or option types. 2741 */ 2742 if (opt->ip6po_rthdr == NULL) 2743 newdest = &opt->ip6po_dest1; 2744 else 2745 newdest = &opt->ip6po_dest2; 2746 break; 2747 case IPV6_RTHDRDSTOPTS: 2748 newdest = &opt->ip6po_dest1; 2749 break; 2750 case IPV6_DSTOPTS: 2751 newdest = &opt->ip6po_dest2; 2752 break; 2753 } 2754 2755 /* turn off the previous option, then set the new option. */ 2756 ip6_clearpktopts(opt, optname); 2757 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2758 if (*newdest == NULL) 2759 return (ENOBUFS); 2760 bcopy(dest, *newdest, destlen); 2761 2762 break; 2763 } 2764 2765 case IPV6_2292RTHDR: 2766 case IPV6_RTHDR: 2767 { 2768 struct ip6_rthdr *rth; 2769 int rthlen; 2770 2771 if (len == 0) { 2772 ip6_clearpktopts(opt, IPV6_RTHDR); 2773 break; /* just remove the option */ 2774 } 2775 2776 /* message length validation */ 2777 if (len < sizeof(struct ip6_rthdr)) 2778 return (EINVAL); 2779 rth = (struct ip6_rthdr *)buf; 2780 rthlen = (rth->ip6r_len + 1) << 3; 2781 if (len != rthlen) 2782 return (EINVAL); 2783 2784 switch (rth->ip6r_type) { 2785 case IPV6_RTHDR_TYPE_0: 2786 if (rth->ip6r_len == 0) /* must contain one addr */ 2787 return (EINVAL); 2788 if (rth->ip6r_len % 2) /* length must be even */ 2789 return (EINVAL); 2790 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2791 return (EINVAL); 2792 break; 2793 default: 2794 return (EINVAL); /* not supported */ 2795 } 2796 2797 /* turn off the previous option */ 2798 ip6_clearpktopts(opt, IPV6_RTHDR); 2799 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2800 if (opt->ip6po_rthdr == NULL) 2801 return (ENOBUFS); 2802 bcopy(rth, opt->ip6po_rthdr, rthlen); 2803 2804 break; 2805 } 2806 2807 case IPV6_USE_MIN_MTU: 2808 if (len != sizeof(int)) 2809 return (EINVAL); 2810 minmtupolicy = *(int *)buf; 2811 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2812 minmtupolicy != IP6PO_MINMTU_DISABLE && 2813 minmtupolicy != IP6PO_MINMTU_ALL) { 2814 return (EINVAL); 2815 } 2816 opt->ip6po_minmtu = minmtupolicy; 2817 break; 2818 2819 case IPV6_DONTFRAG: 2820 if (len != sizeof(int)) 2821 return (EINVAL); 2822 2823 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2824 /* 2825 * we ignore this option for TCP sockets. 2826 * (RFC3542 leaves this case unspecified.) 2827 */ 2828 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2829 } else 2830 opt->ip6po_flags |= IP6PO_DONTFRAG; 2831 break; 2832 2833 case IPV6_PREFER_TEMPADDR: 2834 if (len != sizeof(int)) 2835 return (EINVAL); 2836 preftemp = *(int *)buf; 2837 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2838 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2839 preftemp != IP6PO_TEMPADDR_PREFER) { 2840 return (EINVAL); 2841 } 2842 opt->ip6po_prefer_tempaddr = preftemp; 2843 break; 2844 2845 default: 2846 return (ENOPROTOOPT); 2847 } /* end of switch */ 2848 2849 return (0); 2850 } 2851 2852 /* 2853 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2854 * packet to the input queue of a specified interface. Note that this 2855 * calls the output routine of the loopback "driver", but with an interface 2856 * pointer that might NOT be &loif -- easier than replicating that code here. 2857 */ 2858 void 2859 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 2860 { 2861 struct mbuf *copym; 2862 struct ip6_hdr *ip6; 2863 2864 copym = m_copy(m, 0, M_COPYALL); 2865 if (copym == NULL) 2866 return; 2867 2868 /* 2869 * Make sure to deep-copy IPv6 header portion in case the data 2870 * is in an mbuf cluster, so that we can safely override the IPv6 2871 * header portion later. 2872 */ 2873 if ((copym->m_flags & M_EXT) != 0 || 2874 copym->m_len < sizeof(struct ip6_hdr)) { 2875 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2876 if (copym == NULL) 2877 return; 2878 } 2879 2880 #ifdef DIAGNOSTIC 2881 if (copym->m_len < sizeof(*ip6)) { 2882 m_freem(copym); 2883 return; 2884 } 2885 #endif 2886 2887 ip6 = mtod(copym, struct ip6_hdr *); 2888 /* 2889 * clear embedded scope identifiers if necessary. 2890 * in6_clearscope will touch the addresses only when necessary. 2891 */ 2892 in6_clearscope(&ip6->ip6_src); 2893 in6_clearscope(&ip6->ip6_dst); 2894 2895 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 2896 } 2897 2898 /* 2899 * Chop IPv6 header off from the payload. 2900 */ 2901 static int 2902 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 2903 { 2904 struct mbuf *mh; 2905 struct ip6_hdr *ip6; 2906 2907 ip6 = mtod(m, struct ip6_hdr *); 2908 if (m->m_len > sizeof(*ip6)) { 2909 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2910 if (mh == 0) { 2911 m_freem(m); 2912 return ENOBUFS; 2913 } 2914 M_MOVE_PKTHDR(mh, m); 2915 MH_ALIGN(mh, sizeof(*ip6)); 2916 m->m_len -= sizeof(*ip6); 2917 m->m_data += sizeof(*ip6); 2918 mh->m_next = m; 2919 m = mh; 2920 m->m_len = sizeof(*ip6); 2921 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2922 } 2923 exthdrs->ip6e_ip6 = m; 2924 return 0; 2925 } 2926 2927 /* 2928 * Compute IPv6 extension header length. 2929 */ 2930 int 2931 ip6_optlen(struct inpcb *in6p) 2932 { 2933 int len; 2934 2935 if (!in6p->in6p_outputopts) 2936 return 0; 2937 2938 len = 0; 2939 #define elen(x) \ 2940 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2941 2942 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2943 if (in6p->in6p_outputopts->ip6po_rthdr) 2944 /* dest1 is valid with rthdr only */ 2945 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2946 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2947 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2948 return len; 2949 #undef elen 2950 } 2951